package com.itheima.tlias.utils;

import io.jsonwebtoken.Claims;
import io.jsonwebtoken.Jwts;
import io.jsonwebtoken.SignatureAlgorithm;

import java.util.Date;
import java.util.Map;

public class JwtUtils {

	private static String signKey = "SVRIRUlNQQ==";
	private static Long expire = 43200000L;

	/**
	 * 生成JWT令牌
	 *
	 * @return JWT令牌
	 */
	public static String generateJwt(Map<String, Object> claims) {
		String jwt = Jwts.builder()
				.addClaims(claims)
				.signWith(SignatureAlgorithm.HS256, signKey)
				.setExpiration(new Date(System.currentTimeMillis() + expire))
				.compact();
		return jwt;
	}

	/**
	 * 解析JWT令牌
	 *
	 * @param jwt JWT令牌
	 * @return JWT第二部分负载 payload 中存储的内容
	 */
	public static Claims parseJWT(String jwt) {
		Claims claims = Jwts.parser()
				.setSigningKey(signKey)
				.parseClaimsJws(jwt)
				.getBody();
		return claims;
	}
}
